Exam (elaborations)
STATS 110 Practice Exam Study Detailed Questions and Expert Answers
- Course
- STAT 110
- Institution
- Harvard University
STATS 110 Practice Exam Study Detailed Questions and Expert Answers
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STATS 110 Practice Exam Study DetailedQuestions and Expert Answers
The _________________ is/are the entire group of individuals or items being
studied. - ANS population
The _________________ is/are a subset of the population that is being studied. -
ANS sample
A _________________ is a numerical measurement describing some characteristic
of a population. - ANS parameter
A _________________ is a numerical measurement describing some characteristic
of a sample. - ANS statistic
Suppose that a researcher is interested in the average standardized test score for
fifth graders in a local school district. The fifth graders at a specific school would
comprise a ___________ and their average test score would be a ___________. -
ANS sample, statistic
A ________________ variable classifies individuals based on some attribute or
characteristic. - ANS qualitative
A ________________ variable counts or measures something and has numeric
values. - ANS quantitative
, Can a qualitative variable have values that are numeric? Why or why not? - ANS
Yes; it is possible to have numeric variables that do not count or measure
anything, and, as a result, are qualitative rather than quantitative.
Explain why Social Security Number is considered a qualitative variable even
though it contains numbers. - ANS Addition and subtraction of Social Security
Numbers does not provide meaningful results. This makes it qualitative even
though it is numeric.
In a television advertisement, a company called "Waist Away" claimed the workout
program on their set of DVDs would help people lose weight more than any other
DVD workout program. To test this claim, an independent company, called "Slim
Down," selected one other DVD program. They then randomly assigned half the
volunteers to the Waist Away program and the other half to the Slim Down
program. Each participant was weighed before they started the program and then
regularly participated in their assigned program for one month. After one month,
each participant was weighed again. The percent of weight lost was recorded for
each person, where negative values indicated a weight gain. What type of study
was performed? - ANS experiment
Do people walk faster in an airport when they are departing (getting on a plane) or
after they have arrived (getting off a plane)? An interested passenger watched a
random sample of people departing and a random sample of people arriving and
measured the walking speed (in feet per minute) of each. What type of study
design is being performed? - ANS observational study
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